Join Roadtrek Facebook Groups
I recommend you call Sean Heinz at Roadtrek. Also join the Roadtrek Zion and Simplicity Owners Group on Facebook. A great resource for your van. It is fixable, you just need to find the issue. These vans are complicated, when they work the hey are awesome.
Travel with GSD
I travel with my 80 pound GSD all the time in my Agile. I have a rug/dog bed right behind the cab, and she either hangs out there or on the back bed while driving. At night she sleeps in her bed on the floor, again behind the cab. She's a big dog, so if I need to move about...